Attachment for lathes.



W. GODDU.

ATTACHMENT FOR LATHES.

` APPLICAHON F1LED1UNE19,1915.

'il 6,528., Famed. Nov. 28, 1915.

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ATTACHMENT FOR LATI-IES.

. Specification of Letters Patent.

Patented vee.V es, 191e.

Application filed .Tune19, 1916. Serial No. 104,362.

To all 'Lv/wm z't may concern:

Be it known that l, WILLIAM GQDDU, a citizen of the United States, and aresident of lllinchester, in the county of Middlesex and State of Massachusetts, have inventedV an improvement in Attachments for Lathes, of whichv the following description, in connection With the accompanying drawings, is a speciiication, like characters on the drawings representing likey parts.

This invention relates to lathes and more particularly to an attachment for lathes of ordinary construction, whereby thelatter are enabled to perform Work oi lvarious kinds; that is, straight or irregular Work. To this end, the attachment is provided With a sta tionary member, which has provision for being mounted on the center point or spindle and firmly secured thereto, and a movable tool-carrying member which is mounted to move on the said stationary member, and has provision for attachment to the tool post' of the ordinary lathe, so as to move therewith in. the direction oi the length of the Work, and said movable member is provided with a tool holder, which is capable oi being moved on the tool-carrying member transversely with relation to the Work, by a pat* ternsecured to the said stationary member. The pattern referred tomayy be a plate or bar, which is of the shape it is desired to impart to the work, and 1t is detachably secured to the stationary member so as to enable other patterns of different shapes to be employed' if desired. These and other fea* tures oi' this invention Will be pointed out in the claims at the end of this speciiication.

Figure 1 is a planvieiv of a suiiicient portion of an ordinary lathe provided With an attachment embodying the invention vto enable it to be understood. Fig. 2, a plan of the attachment removed from the lathe. Fig. 3, a front elevation of the attachment shown in Fig. 2. Fig. s, a section on an enlarged scale, taken on the line 4 4, Fig. 2. Fig. 5, an end elevation 'of the attachment looking toward the left in Fig. 2, and Fig. 6, a detail to'represent the character of the work performed on the lathe shown in Fig. 1.

Referring to the drawing, a represents `a latheof ordinary construction, such as novv commonly found in machine shops, and which is provided Witha chuck Z2 and spindle c to hold and center the Work tl, and with a carriage c movable longitudinally of' the lathe and provided With a tool post f, which is movable on the carriage e by means of the 'screw rod g provided. With the hand Wheel it. The carriage c is moved longitudinally of the lathe by means of the hand Wheel t ina manner Well understood. The parts ot' the lathe as thus iar described are of Well-known construction, and the lathe is usually provided with a cutting tool, not shown, but which is inserted through a slot in the tool post and iirmly secured to the latter.

With the lathe ot' ordinary construction and as thus far described, one class of Work can be performed; that is, a straight cut can be made in the Work which is parallel with the spindle c and the longitudinal center of the Work.

rihe present invention has Jorits object to provide lathes of the character described ivith means for enabling articles of different 'being moved With relation to the arm by means of a slot 17 in the arm, through which the end ot the rod 14. is extended. The arm 10 and the rod 14C constitute What may he considered the stationary member oi the attachment.

he rod 1ihas mounted on it to slide thereon a movable tool carrying member, one form of which is herein shown and consists of a bar Q0, Which has its rear end of suit-able sizeto be inserted into the slot in the tool post and be firmly secured thereto by the screw 21, the same as the ordinary tool is secured in said post.

The bar 2O at its iront end is slotted longitudinally to form a chamber 9.2 (see Fig. 4), having side Walls Q5 to Which are removably secured an end plate 26 and a top plate 27. The top plate Q7 extends but a portion of the length of the chamber 22, so` as to leave a portion of the latter open at its top, and the side` walls of the open portion oi" the chamber are provided with openings 26 through which the work d can extend, so as to allow the bar 20 to be moved lengthwise ofthe work.

The tool-carrying member 2O has located in the chamber 22 a tool holder in the .form of a block 30, which is capable of moving in the chamber 22,'and said block is provided with a concavity or r-ecess 31, which cooperates with the openings 26 in the side walls 25 to aiford a free passage for the work d. I 1 n r The block 30 carries a tool 35 for acting on the wor The tool 35 may be of any suitable or usual construction and is represented as a cutting tool, which has its rear end inserted into a socket or opening 36 eX- tended into the block 30 from the wall of the cavity 31. The tool 35 may be secured in its adjusted position in the socket 36 by a screw 37, whose head 38 is designed to engage the tool 35 and firmly clamp it in its socket against movement.

The tool holder 30 is movable in the chamber 22 transversely with relation to the work Z and longitudinally of the carrier 2O for the tool holder 30, and such movement in one direction is effected by means of a spring 40 (see Fig. 4), and in the opposite direction by a pattern 41, which is shown in the present instance as a bar afiiXed to the rod 14 of the stationary member, by nuts 42 engaging threaded studs 43 extended from the said rod. The pattern 41 in `the present instance is wider at one end than at the other, and the straight front edge of the wider portion, marked in Fig. 2, is connected with the straight front edge of the narrower portion, marked 51, by an inclined edge, marked 52.

The front edge of the pattern bar 41 has cooperating with it a device, which is movable with the tool holder 30, said device being shown as a plate 53, which overlaps the pattern bar 41 and is provided with a hub 54, which engages the front edge of the pattern b ar, and which is secured to the tool holder by the screw (see Fig. 4). The hub 54 is kept in engagement with the front edge of the pattern bar 41 by the spring 40.

From the above description, it will be seen that as the tool-carrying member 20 is moved lengthwise of the pattern bar 41, the cutting tool 35 follows the contour of the pattern and shapes the work accordingly.

In the present instance, if the tool-carrying member 2,0 traveled the length of the particular pattern herein shown, the tool would cut the work so as to form straight surfaces connected by an intermediate inclined surface. In thel present instance, it is designed to use only the inclined surface and provide the work with a tapered end, as represented by dotted lines in Fig. 6,

' which arrangement is useful in providing tools, such as punches or sets with a cylindrical rear or body portion anda tapered or conical end portion 61.

By reference to Fig. l, it will be seen that if the carriage e is moved in the direction of the arrow 62, the tool 35 will effect a cut which inclines from the end of the work toward the outer surface thereof, and that by succeedingnclined cuts represented by the dotted lines of different length in Fig. 6, the work may bey provided with a tapering or conical nose orV- end portion.

Ifit is desired to make a straight cut parallel with the axis of the spindle c, the carriage e is moved so as to bring the hub 54 into engagement with a straight portion ofthe pattern or the latter-may be reversed on the rod 14 so as to present its straight rear edge to thehub 54.

The pattern bar 41 if desired may be provided vvith slots to permit the pattern bar lto be inclined with relation to the rod 14, so as to obtain with a single pattern bar tapers of different degrees.

I have herein shown one form of pattern, but it is notl desired to limit the invention to the particular form herein shown or to the particular method of mounting the pattern on the stationary member.

Claims. f

1. The combination with a lathe provided with a spindle and with a carriage having a tool post, of an attachment comprising a stationary member affixed to. said spindle and provided with a pattern, anda movable member engaged with said tool post and movable on said stationary member and provided with a tool holder coperating with said pattern and bodily movable on said movable member substantially at right angles to said spindle.

2. An attachment for lathes provided with carriages having tool posts, comprising a stationary member capable of being attached to the spindle of said lathe and provided with a pattern detachably secured to said stationary member to permit it to be re moved from the latter without disturbing the relation of the stationary member to the said spindle, and a movable member capable of engaging the tool post of the lathe and provided with a tool holder movable on the stationary member and cooperating with said pattern. Y

3. An attachment for lathes comprising a stationary member capable of being aiixed to a stationary part of the lathe and provided with a pattern detachably secured thereto, and a movable member comprising a tool carrying member' mounted on said stationary member to move thereon with relation to said pattern.

4. An attachment for lathes comprising a stationary member and a movable member, said stationary member having an arm capable of being mounted on a spindle of the lathe, and a rod extended from said arm Substantially at right angles thereto, and a pattern secured to said rod, said movable Ine1n ber having a bar mounted to slide on said rod and provided With a chamber, a tool holder movable in said chamber and provided with a device engaging said pattern, and yielding means acting on said holder to maintain said device in engagement with said pattern.

In testimony whereof7 I have signed my name to this specification.

WILLIAM GODDU.

Copies of this patent may be obtained for ve eents each, by addressingythe Commissioner of Patents, Washington, D. C. 

